This patch is not required to compile/run golddig. Its only purpose is to 
improve the game (IMHO)  --jmz

*** golddig.c~	Thu Dec 14 20:41:03 1989
--- golddig.c	Sun Nov 20 01:23:40 1994
***************
*** 29,34 ****
--- 29,38 ----
  
  #define EVMASK KeyPressMask | ExposureMask | ButtonPressMask | FocusChangeMask
  
+ int x_lives, x_initial_score;
+ #define TURBO 15
+ int x_turbo = TURBO;
+ 
  int newlevel = 0;       /* Non-zero if a new level was just drawn */
  struct itimerval cycletime; /* Structure used when setting up timer */
  /* These are the graphics cursors used for drawing the player at */
***************
*** 167,177 ****
      puts("z,<,q,u,R13 - make hole left");
      puts("x,>,e,o,R15 - make hole right");
      puts("r,y,R7 - put down any held item");
!     puts("1-9 - change the game speed");
      puts("\n^S,^Z - pause the game");
      puts("^Q,^Y - reactivate the game");
      puts("^C - kill the game");
      puts("^R - redraw the screen");
      break;
    /* A space bar changes the command to STAND */
    case XK_space:    case XK_R11:
--- 171,182 ----
      puts("z,<,q,u,R13 - make hole left");
      puts("x,>,e,o,R15 - make hole right");
      puts("r,y,R7 - put down any held item");
!     puts("0-9 - change the game speed (0 is *very* fast)");
      puts("\n^S,^Z - pause the game");
      puts("^Q,^Y - reactivate the game");
      puts("^C - kill the game");
      puts("^R - redraw the screen");
+     puts("^A - restart the level");
      break;
    /* A space bar changes the command to STAND */
    case XK_space:    case XK_R11:
***************
*** 251,256 ****
--- 256,262 ----
    regen_tree();
    /* Freeze action until a key is pressed */
    newlevel = 1;
+   x_initial_score = score;
  }
  
  /* Move player one movement */
***************
*** 299,304 ****
--- 305,311 ----
         ((code & UPLEVEL) && ! (code & INACTIVE)))  {
        /* Increment the level number */
        levelnum ++;
+       x_lives++;
        /* Load the next level in if the current one is done */
        init_level();
        /* Redraw the level */
***************
*** 309,316 ****
        return;
      }
      /* If the block is a killer block, kill the player */
!     if(code & KILLIN)
        died("was crushed");
    }
    /* Do not let PUTDOWN order stay after movement has started */
    else if(curorder == PUTDOWN)
--- 316,332 ----
        return;
      }
      /* If the block is a killer block, kill the player */
!     if(code & KILLIN) {
!       if(--x_lives) { /* restart level */
! 	  goldleft = 0; player.ypos = 0; code |= UPLEVEL; code |= INACTIVE;
! 	  score = x_initial_score;
! 	  init_level();
! 	  redrawall();
! 	  XFlush(disp);
! 	  return;
!       }
        died("was crushed");
+     }
    }
    /* Do not let PUTDOWN order stay after movement has started */
    else if(curorder == PUTDOWN)
***************
*** 350,357 ****
    /* Check if the player is overlapping one of the bad guys while not */
    /* holding armor. */
    if(! (fast_lookup[player.hold].code & ARMOR) &&
!      overlap_badguy(player.xpos,player.ypos,-1))
      died("was eaten");
    /* Redraw player if he moved.  Redraw occasionally anyway. */
    if(player.xpos != player.xold || player.ypos != player.yold ||
       (curtick & 0xf) == 0)
--- 366,382 ----
    /* Check if the player is overlapping one of the bad guys while not */
    /* holding armor. */
    if(! (fast_lookup[player.hold].code & ARMOR) &&
!      overlap_badguy(player.xpos,player.ypos,-1)) {
!       if(--x_lives) { /* restart level */
! 	  goldleft = 0; player.ypos = 0;
! 	  score = x_initial_score;
! 	  init_level();
! 	  redrawall();
! 	  XFlush(disp);
! 	  return;
!       } 
      died("was eaten");
+   }
    /* Redraw player if he moved.  Redraw occasionally anyway. */
    if(player.xpos != player.xold || player.ypos != player.yold ||
       (curtick & 0xf) == 0)
***************
*** 422,428 ****
            sscanf(argv[i]+2,"%d",&speed);
        }
        else {
!         printf("usage: golddig [-l <level>] [-s <speed 1-9>] [<world name>]\n");
          exit(1);
        }
      }
--- 447,453 ----
            sscanf(argv[i]+2,"%d",&speed);
        }
        else {
!         printf("usage: golddig [-l <level>] [-s <speed 0-9>] [<world name>]\n");
          exit(1);
        }
      }
***************
*** 434,440 ****
    }
    /* remember what the starting level was */
    levelstart = levelnum;
! 
    /* start up x windows and all graphics cursors for drawing level */
    xstart(EVMASK);
    /* reassemble the graphics cursors to prepare for actual play */
--- 459,467 ----
    }
    /* remember what the starting level was */
    levelstart = levelnum;
!   x_lives = 6 - levelnum;
!   if (x_lives < 1)
!       x_lives = 1;
    /* start up x windows and all graphics cursors for drawing level */
    xstart(EVMASK);
    /* reassemble the graphics cursors to prepare for actual play */
***************
*** 467,475 ****
    init_level();
   
    /* initialize timer structure according to speed */
!   if(speed <= 0)
      speed = 1;
!   if(speed <= 5)
      cycletime.it_interval.tv_usec = (5-speed) * 50000 + 125000;
    else
      cycletime.it_interval.tv_usec = 625000 / speed;
--- 494,504 ----
    init_level();
   
    /* initialize timer structure according to speed */
!   if(speed < 0)
      speed = 1;
!   if(speed == 0)
!     cycletime.it_interval.tv_usec = 625000 / x_turbo;
!   else if(speed <= 5)
      cycletime.it_interval.tv_usec = (5-speed) * 50000 + 125000;
    else
      cycletime.it_interval.tv_usec = 625000 / speed;
***************
*** 517,528 ****
          case XK_R: case XK_r:
            redrawall();
            break;
          }
        /* Pressing a number changes the game speed */
!       else if(keyhit >= XK_1 && keyhit <= XK_9) {
          speed = (int) (keyhit - XK_0);
          /* Compute new cycle delay */
!         if(speed <= 5)
            cycletime.it_interval.tv_usec = (5-speed) * 50000 + 125000;
          else
            cycletime.it_interval.tv_usec = 625000 / speed;
--- 546,569 ----
          case XK_R: case XK_r:
            redrawall();
            break;
+         /*  ^A restarts the current level */
+         case XK_A: case XK_a:
+ 	  if(--x_lives) { /*  restart level */
+ 	      goldleft = 0; player.ypos = 0;
+ 	      score = x_initial_score;
+ 	      init_level();
+ 	      redrawall();
+ 	  } else
+ 	      died("was abandoned");
+ 	  break;
          }
        /* Pressing a number changes the game speed */
!       else if(keyhit >= XK_0 && keyhit <= XK_9) {
          speed = (int) (keyhit - XK_0);
          /* Compute new cycle delay */
! 	if(speed == 0)
!           cycletime.it_interval.tv_usec = 625000 / x_turbo;
!         else if(speed <= 5)
            cycletime.it_interval.tv_usec = (5-speed) * 50000 + 125000;
          else
            cycletime.it_interval.tv_usec = 625000 / speed;
*** shared.c~	Sun Nov 20 00:59:30 1994
--- shared.c	Sun Nov 20 01:25:00 1994
***************
*** 279,287 ****
  void draw_score()
  {
    char buf[50];
  
    /* Build the output string */
!   sprintf(buf,"score: %d  level: %d  speed: %d",score,levelnum,speed);
    /* Clear the current score line */
    XFillRectangle(disp,wind,blackgc,0,ysize << 4,xsize << 4,SCORESIZE);
    /* Actually draw the text */
--- 279,288 ----
  void draw_score()
  {
    char buf[50];
+   extern int x_lives;
  
    /* Build the output string */
!   sprintf(buf,"score: %d  level: %d  speed: %d  lives: %d",score,levelnum,speed,x_lives);
    /* Clear the current score line */
    XFillRectangle(disp,wind,blackgc,0,ysize << 4,xsize << 4,SCORESIZE);
    /* Actually draw the text */
*** makelev.c~	Thu Dec 14 20:40:34 1989
--- makelev.c	Sun Nov 20 01:54:47 1994
***************
*** 1,3 ****
--- 1,4 ----
+ int x_lives;
  /* This program was written by Alexander Siegel in September of 1989   */
  /* at Cornell University.  It may may copied freely for private use or */
  /* public dispersion provided that this comment is not removed.  This  */